<template>
    <div>
        <!-- 面包屑区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <el-alert show-icon title="添加商品信息" type="info" :closable="false" center></el-alert>

            <!-- 步骤条区域 -->
            <!-- active值需要是数字类型 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <!-- 添加商品的tab -->
                <el-tabs v-model="activeIndex" tab-position="left" :before-leave="beforeLeave" @tab-click="tabClick">
                    <el-tab-pane label="基本信息">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader clearable expand-trigger="hover" :options="catelist" :props="cateProps"
                                v-model="addForm.goods_cat">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数">
                        <el-form-item :key="item.attr_id" :label="item.attr_name" v-for="item in manyData">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border>
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性">
                        <el-form-item :key="item.attr_id" :label="item.attr_name" v-for="item in onlyData">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片">
                        <!-- action 表示图片要上传到的后台API地址 -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                            list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'

export default {
    data() {
        return {
            activeIndex: '0',
            addForm: {
                goods_name: '哈哈',
                goods_cat: [1, 3, 6],
                goods_price: 10,
                goods_number: 10,
                goods_weight: 10,
                goods_introduce: '',
                pics: [],
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择到商品三级分类', trigger: 'change', min: 3, type: 'array' }
                ]
            },
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            manyData: [],
            onlyData: [],
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewVisible: false,
            previewPath: '',
        }
    },
    created() {
        this.getCate()
    },
    methods: {
        async getCate() {
            const res = await this.$http.get('categories')
            console.log(res);
            if (res.status == 200) {
                this.catelist = res.data.data
            }
        },

        // 在离开当前tab前做校验返回true就是可以跳转，false则阻止
        beforeLeave(active, oldActive) {
            if (oldActive == '0') {
                if (!this.addForm.goods_name || this.addForm.goods_cat.length != 3) {
                    this.$message.error('请完善商品信息')
                    return false
                }
            }
        },

        async tabClick() {
            if (this.activeIndex == '1') {
                // 请求动态参数
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    {
                        params: { sel: 'many' }
                    }
                )

                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }

                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                })

                this.manyData = res.data

                // console.log(this.manyData);

            } else if (this.activeIndex == '2') {
                // 请求静态属性
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    {
                        params: { sel: 'only' }
                    }
                )

                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }

                this.onlyData = res.data
            }
        },

        // 处理图片预览
        handlePreview(file) {
            // console.log(file);
            this.previewPath = file.url

            this.previewVisible = true
        },

        handleSuccess(response) {
            console.log(response);
            if (response.meta.status == 200) {
                const pic = response.data.tmp_path
                this.addForm.pics.push({ pic })
            }
        },

        // 处理图片删除
        handleRemove(file) {
            // console.log(file)
            // 1. 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2. 从 pics 数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },

        // 最后的提交
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项！')
                }
                // 执行添加的业务逻辑
                // lodash   cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })

                form.attrs = this.addForm.attrs
                console.log(form)

                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const { data: res } = await this.$http.post('goods', form)

                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }

                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length == 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        },
    }
}
</script>
<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}

.previewImg {
    width: 100%;
}

.btnAdd {
    margin-top: 15px;
}
</style>
